function g = sigmoid(z)
%SIGMOID Compute sigmoid function
%   g = SIGMOID(z) computes the sigmoid of z.

% You need to return the following variables correctly 
g = zeros(size(z));

% ====================== YOUR CODE HERE ======================
% Instructions: Compute the sigmoid of each value of z (z can be a matrix,
%               vector or scalar).

if(length(g) == 1)
    g = 1 / ( 1 + exp(-z));
else
    [col, row] = size(z);
    g = 1 ./ (1 + exp(- z));

    



% =============================================================

end